Kinetics of Photocatalytic Degradation of Methylene Blue in Aqueous Dispersions of TiO₂ Nanoparticles under UV-LED Irradiation

S. L. N. Zulmajdi¹, S. N. F. H. Ajak¹, J. Hobley¹, N. Duraman², M. H. Harunsani¹, H. M. Yasin¹, M. Nur³ and A. Usman^1,

¹Department of Chemistry, Faculty of Science, Universiti Brunei Darussalam, Jalan Tungku Link, Gadong BE1410, Negara Brunei Darussalam

²Department of Physics, Faculty of Science, Universiti Brunei Darussalam, Jalan Tungku Link, Gadong BE1410, Negara Brunei Darussalam

³Center for Plasma Research, Department of Physics, Faculty of Science and Mathematics, Universitas Diponegoro, Kampus Undip Tembalang, Semarang 50239, Indonesia

Cite this paper:
S. L. N. Zulmajdi, S. N. F. H. Ajak, J. Hobley, N. Duraman, M. H. Harunsani, H. M. Yasin, M. Nur and A. Usman. Kinetics of Photocatalytic Degradation of Methylene Blue in Aqueous Dispersions of TiO₂ Nanoparticles under UV-LED Irradiation. American Journal of Nanomaterials. 2017; 5(1):1-6. doi: 10.12691/ajn-5-1-1

Abstract

We investigated the degradation of methylene blue (MB) as an organic dye pollutant upon photocatalytic oxidation of TiO₂ nanoparticles under UV-LED (395 nm) light irradiation. Effect of different parameters, including initial concentration of dye and catalyst dosage on the degradation rate of the dye were evaluated. We found that the photonic efficiency of the photocatalytic degradation rate of the dye was determined by the ratio between the initial concentration of the dye and the number of TiO₂ nanoparticles in the colloidal solution. The optimum photocatalytic degradation rate was achieved when the TiO₂ nanoparticles in the solution are well covered by dye molecules, providing an interpretation that MB–TiO₂ molecular interactions play the key role in the photoinduced oxidation and reduction, leading to the photocatalytic degradation. We also demonstrated that the energy activation of the photocatalytic degradation is related to diffusion-controlled reaction, indicating that the photocatalytic degradation of the dyes is diffusion-controlled reaction of free hydroxyl radicals.

Keywords:
photocatalysis methylene blue degradation TiO₂ Nanoparticles temperature effect

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